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Frank,

I am having similar issues with my very large groups.io community.

Can you cite the Reason code for these rejections? Is it predominantly a given reason?

Most of our community uses gmail so the provider is Google, ie, not
exactly a "provider worth using".

Actually, one of the most reliable of the mailbox providers I've used.

Could it be the DKIM keys need to be updated?

It doesn't seem like it. I'm not having any rejections of messages to my Gmail addresses. Your message shows that Gmail believes (as of then) that Gmail thinks Groups.io's authentication is fine:

Authentication-Results: mx.google.com;
dkim=pass header.i@... header.s=20140610
header.b=iiGiqw0z;
spf=pass (google.com: domain of
[email protected] designates 66.175.222.12 as
permitted sender)

Shal


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